Metal-cutting-off device.



B. E. SMITH.

METAL CUTTING OFF DEVICE.

APPLIOATION FILED 13110.21, 1912.

Patented Sept. 23, 1913.

2 SHEETS-SHEET 1 3 n uentoz ELMER E-SMFTH ANOORAPH C COLUMBIA PL E. E. SMITH.

METAL CUTTING OFF DEVICE.

APPLICATION FILED 1130.21, 1912.

1,073,873. Patented Sept 23, 1913.

2 SHEETS-SHEET 2.

awwwtoz E LM ER E SM \T H iwi 44200 attomzq orrrp srarns ATENT rrion.

ELMER E. SMITH, OF LEWISIOW I'ENNSYLVANIA.

METAL-GUTTING-OFF DEVICE.

To all whom it may concern:

Be it known that 1, Emma E. SMITH, a citizen of the United States, residing at Lewistown, in the county of Milllin and State of Pennsylvania, have invented certain new and useful Improvements in Metal Cutting-6ft Devices, of which the following is a specification, reference being had to the accompanying drawings.

This invention comprehends certain new and useful improvements in metal-cuttingoff devices.

An object of the invention is to construct the teeth and the seats for the same in the blade in such manner that the teeth will be securely locked in the seats provided therefor and may be readily forced in place without danger of breaking the edges of the teeth.

Another object is to generally improve and simplify the construction of the teeth and provide the same with a tongue upon one edge and a groove upon its opposite edge for engagement with the tongues and grooves in the edges of the seats formed in the periphery of the blade, the keys for looking the teeth in position being also provided with tongues for engagement in the grooves of the teeth and grooves in opposite faces to receive the tongues formed in the seats in the blade.

A further object is to construct the blade and teeth in such manner that the adjusting screws heretofore employed may be dis pensed with, the length of the teeth being regulated by filing the inner ends thereof.

A still further object is to gene ally improve and simplify the construction of devices of this character and increase the etliciency and durability of the same.

lV'it-h these and other objects in view, the invention consists in the novel features of construction and the combination and arrangement of parts hereinafter more fully described, pointed out in the claims, and shown in the acompanying drawings, in Which Figure 1 is an elevational view of my invention, Fig. 2 is a view at right angles to Fig. 1, looking at the edge of the device, Fig. 3 is a detail plan view of the blade, the teeth and keys being removed, Fig. 4 is an elevational view of the blade, showing one edge thereof, Fig. 5 is a similar view, showing the opposite edge of the blade, and Fig.

Specification of Letters Patent.

Application filed December 21, 1912.

Patented Sept. 23,1913.

Serial No. 738,097.

(3 is a slightly enlarged detail sectional View on the line G(l of Fig. 1.

l teferring more particularly to the drawings, in which similar reference characters designate corresponding parts throughout the several views, the numeral 1 designates the circular rotary blade having the seats 2 formed in the edge thereof and opening upon the periphery of said blade. The seats 2 are of substantially rectangular form with a stop projection in one inner corner thereof, as shown at 3. The tongue 1 is positioned centrally upon the short edge of the seat 2 which will be hereinafter designated by the numeral 5, and termed the rear edge of the Silil. A groove (3 is formed in the long or forward edge of the seat by providing the parallel beads 7 projecting slightly into the seat.

Each seat 2 is adapted to accommodate a tooth 8 having a bead 9 formed upon its forward or cutting edge for engagement in the groove (5, while the rear edge is provided with a groove 10 for engagement by the tongue 11. carried upon one edge of the key 12, while the opposite edge of the key 19 is provided with the groove 13 to accommodate the tongue t on the rear edge of the seat 2. One inner or rear corner of the tooth 8 is cut away to avoid the stop 8. The purpose of the stop 3 is to limit the inward movement of the key 12. The inward movement of the tooth S is limited by engagement of the rear end thereof with the end wall 14: of the seat 2. It will be understood that the key 12 is tapered to cause the same to tighten the tooth 8 within the seat 2.

By constructing the blade and teeth in this manner, all danger of the edge of the teeth being broken off during the operation of inserting the teeth will be eliminated, and after the teeth are sharpened, the length thereof may be regulated by filing the inner ends thereof, as will be clearly understood.

It will be apparent that this form of blade and tooth may be employed upon various machines and will be strong and durable and highly efficient in use. It will also be apparent that minor changes in the details of construction may be made within the scope of the appended claims without departing from the spirit of my invention.

lVhat is claimed is 1. The combination with a rotary blade having pocket seats formed around its outer edge with grooves in their forward edges, said pocket seats having short rear edge. with ribs formed thereon, of teeth reinovably positioned in the pocket seats and having ribs formed on their forward edges and engaged in the forward grooves in the forward edges of the pocket seats, said teeth having short rear edges with longitudinal grooves formed therein, and keys positioned between the rear edges of the teeth and rear edges of the pocket seats and formed with ribs upon their forward edges engaged in the grooves of the teeth While grooves are formed in the rear edges of the keys for the ribs upon the short rear edges of the pocket seats.

2. The combination with a rotary blade having pocket seats formed therein with long forward edges and short rear edges having stop projections at their inner extrelnities, of teeth positioned in said pocket seats and having their forward edges interlocked with the forward edges of said pocket seats, said teeth having their rear inner cor ners cut away to avoid the stop projections, and beveled keys engaged between the rear edges of the teeth and pocket seats and against the stop projections, said keys having their opposite edges interlocked with the rear edges of the teeth and pocket seats to lock said teeth within said pockets.

In testimony whereof I hereunto affix my signature in the presence of two witnesses.

ELMER E. SMITH.

Witnesses:

JOHN W. HARRIs, JOHN G. BROOME.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washingten, D. C. 

